Image 1 of 1 Additel 9050-EXT - RS 232 (DB9/M) extension cable, 9 feet $68.00 Add To Cart Added! Additel 9050-EXT - RS 232 (DB9/M) extension cable.Part Number: 9050-EXT. Additel 9050-EXT - RS 232 (DB9/M) extension cable.Part Number: 9050-EXT. You Might Also Like Additel 992-MK Maintenance Kit for ADT992/ADT993 Generators $111.00 Additel 9055 - Green terminal plug (drive valve for I/O) 1 pc $14.00 Additel 9092 - Bath basket for tri-clamp sensors and SPRT for ADT835 $132.00 Additel 9082 - HART 250 ohm resistor adapter for ADT227 and ADT226 $93.00 Additel 9812-AU Power Adapter for ADT681 Gauge $94.00